SEND MESSAGE ON LAN VIA COMMAND PROMPT

It is easy to send messages through cmd prompt to other systems here is the answer
Note: this is for windows xp only

first we have to set our systems messenger ACTIVE for that follow these steps
1. goto RUN
2. type services.msc
3. scrolldown and give RIGHT click on MESSENGER
4. select PROPERTIES
5. then for enabling it go to STARTUP TYPE and select AUTOMATIC
6. then OK

and this should
be performed on both sides (SENDER & RECEIVER)

after that if u want to send message then do the following steps

1. goto cmd prompt

2. type syntax as follows

net send ipaddress of reciever "message to be send"

ex: net send 172.16.6.99 "hello"